| Author |
Message |
    
Jdugger
| | Posted on Wednesday, December 05, 2012 - 12:20 pm: | 
|
Stroke the motor. |
D_adams
| | Posted on Wednesday, December 05, 2012 - 12:30 pm: |
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That's just wrong on so many levels J. |
Jdugger
| | Posted on Wednesday, December 05, 2012 - 01:00 pm: |
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and yet so true |
Rogue_biker
| | Posted on Wednesday, December 05, 2012 - 01:08 pm: |
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I was going to say that "drop throttle oversteer" is when the rear end comes around in a corner (skids around) when throttle is released when negotiating a corner at high speed. Usually ends up with the vehicle doing a 180. It's a characteristic that is not normally desired. Neutral handling is better.
Increased turning rate during braking/deceleration in a motorcycle is normally caused by brake dive, which changes the bike's geometry (lowering the front end) and increases the turn rate. This is desirable.
(Message edited by rogue_biker on December 05, 2012) |
Froggy
| | Posted on Wednesday, December 05, 2012 - 02:13 pm: |
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Jdugger is right, increasing the stroke would do exactly what Andros is looking for. |
Thefleshrocket
| | Posted on Wednesday, December 05, 2012 - 04:42 pm: |
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"http://danielcrowerracing.com/i-5912878-buell-1125 -rr-4-cam-set.html
Those have been available for some time now."
I think I've seen those posted before. And I probably said something to the effect of "$600 for a set of cams isn't too bad, if they make decent power gains--like 10-15hp. Where are the dyno charts?" |
Battyone
| | Posted on Wednesday, December 05, 2012 - 06:45 pm: |
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I've got a crank going to the grinders first thing in the new year.
had new rods made to take a different,easier to get hold of shell and will be having a 60thou offset grind.
just to see if it gives anything.More revs isn't the answer unless changes are made to the shim/valve setup...maybe shim under bucket? but that's lots of work!
And I'll say it again!!! I really don't think cams are needed. |
Mako
| | Posted on Wednesday, December 05, 2012 - 10:32 pm: |
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more fuel? |
Dannybuell
| | Posted on Wednesday, December 05, 2012 - 11:29 pm: |
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@Rogue_biker - in my experience, maximum braking with engine, front brakes or both is done when the bike is vertical or close to vertical.
any additional pressure on the front suspension will cause some suspension travel, compression, jounce, dive whatever.
my S1 has drag bars, I'm pretty much over the tank. 1.0 springs in the front with billet preload slugs and a 2 click Penske on the rear. the bike requires a bit more finesse than the CR. The CR has had similar suspension changes but its lack of engine braking requires less preload. |
Georgehitch17
| | Posted on Thursday, December 06, 2012 - 11:23 am: |
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Does anyone run those cams with proof of a pwoer gain!? |
Mako
| | Posted on Thursday, December 06, 2012 - 01:03 pm: |
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$1300 for cams...very limited production but still too much when whole engines are on ebay for $800ish, whole bikes $5500? what a bang for the buck eh? |
Boogiman1981
| | Posted on Thursday, December 06, 2012 - 02:18 pm: |
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scroll further down Maco they are $600 a set on exchange. and $60/HP isn't really that bad, in fact that's pretty cheap for a bike. |
46champ
| | Posted on Thursday, December 06, 2012 - 02:21 pm: |
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I am curious how much room is there to stroke the motor. If we use the 1190 bore of 4.17 and stroke the motor to 3" we will have 82 inches or stroke it to 3 1/2' we will get a 95" motor. Is this possible. Granted you would need longer cylinders and rods is there room in the crankcase to swing that long of an arm? If we are at the RPM limit because of the valve cam configuration why not build the motor so the limiting factor is piston speed. 11000 RPM at 3 stroke is only 5500 ft per min that isn't a limiting factor. 10000 RPM with a 3 1/2 inch stroke is 5833 ft per min that is pushing it but it should live for a while.
Is the room there? |
Jgarner99
| | Posted on Thursday, December 06, 2012 - 09:33 pm: |
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Can we talk millimeters for bore and stroke, and cubic centimeters for displacement, as Erik and Rotax intended?
I can do the conversion math... But why go to so much trouble? So I can sound more like a Harley guy?
Fuggedaboutit! |
Battyone
| | Posted on Friday, December 07, 2012 - 04:59 am: |
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There's not a lot of room in the crankcase,with my new rods there's maybe 5mm all round.
But to move the pin centre any more than thousandths of an inch,is going to require welding and who wants to be the first person to try that?
I guess the answer to the OP's original question is that it's a race bike strangled with emissions regs. |
46champ
| | Posted on Friday, December 07, 2012 - 10:15 am: |
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The metric system is the work of the Devil and a passing fad. |
